button_label
Description:
The label to show on the button.
Underlines in the button text can be used to indicate a mnemonic.
If set to `NULL`, the button won't be shown.
See [property@Toast:action-name].
The label to show on the button.
Underlines in the button text can be used to indicate a mnemonic.
If set to `NULL`, the button won't be shown.
See [property@Toast:action-name].